Coyote Crawl Glaze over Red Iron Oxide?

Need a unique glaze, color, texture combination for class. I made a vase and I am thinking of trying to do a wash of red iron oxide covered by the Coyote white crawl glaze. Is there anything in red iron oxide that would make the glaze not crawl as it is supposed to? I am still working on understanding chemical mineral interactions. The idea is to make something that looks ancient. I have to order the glaze this week and be ready to proceed within the next week or 2 at most. I can make up a sample item to test it on but not sure I can have it fired in time to be able to change up if I need to before the final. Any help or pointers to take in to consideration when using red iron oxide and coyote white crawl together?

I would recommend a slip rather than iron oxide wash under a glaze...mainly because when a wash would dry it is nothing more than dust...and dust can crawl...not like your intention but the iron could be pulled up with the crawling glaze.

Thanks! I will look into something to color under the crawl rather than just RIO (did I get the abbreviation right?). Could I add Gerstley Borate to it and make it "stick" to the pot more? I'm wondering if an underglaze might also work, was trying to avoid UGs since my teacher thinks I rely on them too much already and was trying to do my final piece without using any. I also need to look into a regular glaze but want something mat in texture for under the crawl to give it a bit of pop between the cracks.

yes, you could add some Gerstley Borate to the iron oxide. If you look at Lana Wilson's book or articles, she uses commercial underglazes under the crawl glaze. I think if you use a regular glaze you might lose the crawling if the two melt as one.

I did some funkiness using a crawl glaze by firing the crawl glaze, then going back with a contrasting glaze and wiping it off the crawled bits and firing a second time. Pain to get the second glaze to stick, but oh FUN results! Thanks for the memories, might have to do that again!

Thought you might like a resolution to the question, I know I sometimes wonder what happened when I read through the old posts and no resolution is ever posted.

I talked it over with my teacher and ended up going with RIO brushed on and wiped off randomly and the 2 coats of Coyotes Cactus Crawl glaze. My teacher was really happy with how it turned out. I really like it too just missed a couple spots with the RIO underneath the handles so its not perfect but I guess I can live with it. The crawl glaze cracked and fragmented really nicely. It's better in person than in the photo since you can't see the RIO peeking through so much more. I like how the RIO almost looks like ancient bronze in spots, might have to play with that affect some more and see if I can get it to do it even more so. Oh and yes it's supposed to look old and cruddy like something dug up from the ruins of an ancient city. I didn't want anything shiny and bright which was the major issue I had in coming up with a finish for the surface.

The piece is actually 2 separate pieces as well as 2 different techniques were used. That was the assignment to make something in 2 parts that make a whole item using 2 different techniques. I used coil building for the vase and slab rolling for the base and the base and vase are separate. I also used 2 glazes or glazing techniques, not sure how to phrase that, by using the RiO brushed then rubbed off and the crawl glaze over the top of it.